<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      var username = prompt("请输入您的姓名");
      var password = prompt("请输入您的密码");
      while (username != "admin" || password != "123456") {
        alert("您的用户名或者密码有误，请重新输入");
        username = prompt("请输入您的姓名");
        password = prompt("请输入您的密码");
      }
      alert("登录成功");
    </script>
  </body>
</html>
